Influences of outdoor meteorological conditions on indoor wintertime short-term PM1 levels
In: Geofizika; ISSN 0352-3659 (Print); ISSN 1846-6346 (Online); Volume 32; Issue 2; (2015)
Online
Elektronische Ressource
Zugriff:
We investigated the relationship between wintertime 1-min mean urban indoor particulate matter mass concentrations for particles with aerodynamic diameter of < 1 μm (PM1) and outdoor atmospheric conditions. Particle concentrations were measured by two light-scattering laser photometers. Aerosol monitors were placed in the ground and first floor corridors of an university building, with inlets at heights of 1.7 m above the floor. The building is located in residential area of Zagreb, Croatia. During the experiment usual student and employee activities were occurring within the building. Surface meteorological data were collected at a nearby outdoor location. Results show the dependence of indoor PM1 on outdoor meteorology, with the strongest responses to air temperature and relative humidity, whilst global radiation impacts were almost negligible. Response times varied from 1.2 hours (for relative humidity) to 2.7 days (for global radiation). Furthermore, elevated mean concentrations point to the 8-9 km distant industrial zone. Both, PM1 and meteorological data series exhibited semidiurnal, diurnal and the long-term (about 10-11 days and about 21 day) periodicity. The long-term periodicity of PM1 time series might be associated with Rossby waves. Possible association with Rossby waves needs to be investigated further.
Ispitali smo vezu između jednominutnih srednjaka zimskih masenih koncentracija lebdećih čestica aerodinamičkog promjera < 1 μm (PM1) izmjerenih u zatvorenom prostoru u urbanom okolišu i vanjskih atmosferskih uvjeta. Koncentracije lebdećih čestica mjerene su dvama laserskim fotometrima. Fotometri su se nalazili u hodnicima u prizemlju i na prvom katu zgrade Sveučilišta, a zrak je u instrumente ulazio na visini od 1.7 m nad tlom. Zgrada se nalazi u rezidencijalnom dijelu Zagreba. Zaposlenici i studenti su se tijekom eksperimenta bavili uobičajenim aktivnostima. Prizemni meteorološki podaci prikupljani na obližnjem vanjskom mjernom mjestu. Rezultati pokazuju ovisnost koncentracija PM1 u zatvorenom prostoru o vanjskim meteorološkim uvjetima. Dok su vanjska temperatura zraka i relativna vlažnost povezane s najjačim odzivom koncentracija lebdećih čestica u zatvorenom prostoru, utjecaj globalnog zračenja gotovo je zanemariv. Vrijeme odziva varira od 1.2 h (za relativnu vlažnost) do 2.7 dana (za globalno zračenje). Nadalje, povišene prosječne koncentracije PM1 pri jugoistočnom strujanju ukazuju na utjecaj 8–9 km udaljene industrijske zone. I u meteorološkim nizovima i u nizovima koncentracija lebdećih čestica prisutna je poludnevna i dnevna periodičnost te dugoperiodičnost (približno 10–11 dana te oko 21 dan). Dugoperiodičnost vremenskih nizova koncentracija PM1 mogla bi biti povezana s Rossbyjevim valovima. Kako bi se potvrdila ta hipoteza, potrebna su daljnja istraživanja.
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Influences of outdoor meteorological conditions on indoor wintertime short-term PM1 levels
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Quelle: | Geofizika; ISSN 0352-3659 (Print); ISSN 1846-6346 (Online); Volume 32; Issue 2; (2015) |
Veröffentlichung: | 2015 |
Medientyp: | Elektronische Ressource |
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